Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1977-08-22
1979-01-02
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
200 6107, 310 68C, 241 33, 340605, H02H 708
Patent
active
041330161
ABSTRACT:
An apparatus comprising a vessel adapted to receive a liquid, and which vessel has a drive shaft extending through the bottom of the vessel from an electric motor below the vessel to a rotary cutting or grinding blade or the like within the vessel, with a seal being provided to seal the vessel with respect to the drive shaft, has a safety device in the form of a cut-out switch which is normally held in its closed position by a plate of water-absorbent, cellulose-fibre based material disposed below the seal. Any aqueous liquid leaking from the seal will wet the plate reducing its strength and allowing the plate to bend to allow the cutout switch to move, under resilient bias to an open position, thus cutting off the supply of electrical current to the electric motor.
REFERENCES:
patent: B367021 (1975-01-01), Howard et al.
patent: 1272308 (1918-07-01), Parker
patent: 3979569 (1976-09-01), Bilgrei
Salce Patrick R.
Seb S.A.
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